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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
calloc doesinitialize your memory block with 0s, but malloc does not.
So the problem may relate to that.
Maybe you didn't put a null ending in the string array?
I didn't do the exercise in c yet so I am not sure.